EP3227173A1 - Detection of a shift operation - Google Patents
Detection of a shift operationInfo
- Publication number
- EP3227173A1 EP3227173A1 EP15775150.4A EP15775150A EP3227173A1 EP 3227173 A1 EP3227173 A1 EP 3227173A1 EP 15775150 A EP15775150 A EP 15775150A EP 3227173 A1 EP3227173 A1 EP 3227173A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- acceleration
- load torque
- vehicle
- tor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000001133 acceleration Effects 0.000 claims description 55
- 230000008859 change Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 2
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000009795 derivation Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 238000004422 calculation algorithm Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 208000010201 Exanthema Diseases 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 201000005884 exanthem Diseases 0.000 description 2
- 206010037844 rash Diseases 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
- B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
Definitions
- This invention relates to a method of detecting a shifting action of a transmission of a vehicle operable with engine power of an engine and / or pedal force. Furthermore, the invention relates to a switch detection device for detecting a switching operation of a transmission of an engine operable with engine power of a motor and / or pedal force vehicle.
- a vehicle that is operable with engine power of an engine and / or pedal force has in many cases a variable ratio transmission for adjusting the cadence to an appropriate wheel speed.
- the engine which may be an electric motor in particular, it is helpful if the engine electronics has information about that
- Switching operation is performed. It is already known to use a change in the engine speed for detecting the switching operation in order to conclude a switching operation. However, this alone is not sufficient to reliably detect a shift, since engine speed changes may also result from other causes.
- This engine load torque depends on the engine torque that the engine inherently generates.
- Engine torque is reduced or boosted before it is delivered as engine load torque when the engine is subject to speed changes.
- An advantage of the method according to the invention is that the speed and the inherent drive torque of the motor are easy to determine, which in the normal case in addition to the sensors usually present no further
- the inherent drive torque can be determined in a simple manner via the current to the motor on an electric motor.
- the load torque and thus also the motor current breaks during a switching operation. The latter results from an increased counter tension caused by the acceleration of the rotating
- Engine parts are created. Another advantage is that the switch identifier is independent of the setting of the motor controller.
- the engine governor can be set to give different speed rates of increase for different operating states or different vehicles, resulting in different engine governors. The onset of the
- the engine load torque can be calculated using the following formula:
- n Mo are tor the engine speed
- Mo tor J the moment of inertia of the engine
- T mo tor an inherent engine torque
- the inherent motor torque may be determined by determining a current through the motor, the current flowing through one or more windings of the motor.
- the current can also flow through a shunt resistor, at which a voltage drop is measured.
- the motor may be connected to a rotor position sensor.
- a rotor angle can be measured several times. The speed can be determined as the average speed by calculating the angle between two rotor positions by subtraction and dividing by the time between measurement times.
- an observer who is implemented in particular as software, estimate the engine speed by calculating values for angular velocity, angular acceleration and the temporal change of the angular acceleration and from this a current engine speed is determined. This may provide a more recent value than with a mean calculation.
- the subclaims relate to preferred developments of the invention.
- an acceleration of the vehicle is measured and corresponding acceleration information taken into account in the detection of a switching operation. This is advantageous because it can happen that short-term strong changes in the engine speed and thus also in the engine load torque can also occur due to overrun unevenness.
- Motor load torque can be related to derive from the ratio, in particular from a synchronization of the two signals, whether an error detection exists.
- Motor load torque can be related to derive from the ratio, in particular from a synchronization of the two signals, whether an error detection exists.
- an off-road drive can be detected even at significant negative fluctuations of the time course of the engine load torque, with positive rashes of the engine load torque are available, which can result from cracks in the field.
- Detection is particularly suitable for e-bikes with rigid rear suspension.
- the engine load torque is subject to some noise even on a road trip, but this noise is much higher when driving off-road.
- the chain can get into vibration, such as when off-road, or the rear wheel can temporarily lose liability, especially if it slips or lifts, resulting in fluctuations in the engine load torque.
- the detection of a switching operation can be rendered less sensitive or switched off. In this way, error detections are reduced or
- the threshold may be in Be adjusted depending on accelerations measured on the vehicle to reduce the likelihood of erroneous detection in rough driving, especially off-road driving. Particularly suitable is the detection of vertical acceleration of the vehicle. Alternatively or additionally, accelerations in other directions may also be suitable. With an increased threshold value, in particular switching operations under high engine load are recognized with good reliability, while switching operations under low engine load tend to be no longer detected. A non-recognition of a
- Shifting operation is preferred over a misrecognition of a switching operation, because the consequences of a misrecognition can irritate a driver considerably.
- the greater sensitivity of detecting a switching operation in a road trip causes switching operations under low engine load are detected with good security.
- the threshold value can be increased after a collapse of the load torque, preferably immediately thereafter.
- Engine load torque used an increase in engine speed to detect a switching operation.
- an increase in engine speed is not recognized as a shift if it causes a reduction in the engine speed
- Vehicle and / or a braking acceleration of the vehicle precedes.
- An upward acceleration of the vehicle may cause one or more wheels of the vehicle to lift off.
- Braking especially blocking of a rear wheel, causes the engine to be subjected to rapid changes in speed, in particular during Letting go of the brake can cause a strong speed increase on the engine. Therefore, it makes sense that resulting from such operations
- off-road driving is detected when a predetermined amount of negative excursions of acceleration is exceeded.
- Such strong negative rashes can occur, for example, in larger jumps, but also when driving over potholes or when driving off curbs or from higher altitude. Stronger blows about through
- one vertical and / or one or more horizontal accelerations can be measured. From the measured accelerations can be composite
- Acceleration vectors are derived.
- a switch detection device for detecting a switching operation is proposed. This is to
- this has an acceleration sensor. This may be arranged spatially separated from other parts of the switch detection device.
- Acceleration sensor an acceleration of the vehicle at least in one direction, but preferably in the vertical direction and in particular additionally measured in the horizontal direction.
- Switch detection device may be configured to, as described above, a threshold for detecting a switching operation
- the acceleration sensor is arranged on a handlebar of the vehicle, in particular of an electric bicycle.
- the acceleration sensor is preferably arranged on or in an operating unit on the handlebar. However, it can also be arranged on a battery or on a drive unit.
- FIG. 1 shows a schematic view of a vehicle which can be operated with engine power of an engine and / or pedal force, namely an electric bicycle,
- Figure 2a is a diagram in which the engine load torque during a
- FIG. 2b is a diagram in which an engine speed over the same
- FIG. 3 a shows a diagram of an engine load torque over time and a variably adjustable threshold value over time
- FIG. 3b shows an engine speed over the same period of time, which is also shown in FIG. 3a and FIG.
- FIG. 3c shows a diagram of an acceleration signal over the same
- FIG. 1 shows a side view of a vehicle which can be operated with engine power and / or pedal force in the form of an electric bicycle 1.
- the electric bicycle 1 comprises a drive unit 2 which generates torque, which is transmitted via a chain 5 to a pinion 6 of a rear wheel 7.
- the electric bicycle 1 has via a derailleur, which is not shown in detail.
- the derailleur can be operated by the driver or automatically.
- Electric bicycle is powered by a battery 4.
- a battery 4 On the handlebar of the bicycle
- Electric bicycle is an operating unit 8 is arranged.
- an acceleration sensor is arranged, which provides acceleration information that can be used to improve the detection of a switching operation.
- the accelerometer may consist of several individual accelerometers and acceleration in both
- FIG. 2 a shows a graph of calculated values of a time derivative of a motor load torque dT Las t / dt over time t, wherein a part of the values was recorded during a shift operation SV.
- the diagram also shows a threshold SW, which lies above the values of the time derivative of the engine load torque dT Las t / dt. If the derivative of the load torque dT Las t / dt exceeds the threshold value SW, then a switching operation SV is detected.
- Figure 2b shows an engine speed n Mo tor over the time t, wherein the period shown corresponds to the period shown in Figure 2a.
- a part of the engine speed graph shows the history during a shift operation SV.
- the engine speed initially rises significantly above the engine speed outside of the shift SV, and then drop to a significantly lower level. Then the engine speed increases back on and leveling off at a level which is slightly below the level before the SV shift. This means that a longer gear ratio has been chosen, with the vehicle speed not having changed significantly.
- FIG. 3 a shows a further diagram of a time derivative of
- the threshold value SW is not constant but variable and is adapted dynamically to the driving operation.
- the threshold SW is set as a function of events in the course of the time derivative of the engine load torque dT Las t / dt.
- An algorithm for setting the threshold SW searches in the derivation of the load torque dT Las t / dt after significant deviations from the standard values without switching operation below the value 0, as they can occur as an event E1. If such a deviation is found, it is concluded that there is a drop in the derivative of the load torque dT Las t / dt caused by the driving operation.
- the derivative of the load torque dT Las t / dt initially increases, so that it can be assumed that there is no switching operation, but rough terrain.
- the algorithm significantly raises the threshold SW. This is useful because after a path-induced collapse of the derivative of the load torque dT Las t / dt after a short time follows a counteracting increase, which is not related to a switching operation, but could be recognized as such without special measures. Therefore, it is useful to raise the threshold value SW because misrecognition of a switching operation can thus be avoided.
- the threshold SW is dependent on
- Acceleration signals set which are shown in the figure 3c. As can be seen from FIG. 3 a, shortly before the end of the illustrated period of time
- Threshold value SW reacts to a collapse in
- Acceleration signal B which is shown in Figure 3c temporally at the same point and as an event E2.
- Such a break in the acceleration B may be interpreted as a jump or other disengagement of a drive wheel with the ground.
- Such an event is usually followed by a rise in the derivative of the engine load torque dT Las t / dt, which is referred to as Switching operation could be misinterpreted.
- the threshold SW since the threshold SW is raised, the likelihood of misrecognition due to the above-mentioned reaction of deriving the engine load torque dT Las t / dt is significantly reduced.
- FIG. 3b shows the engine speed riMotor over time in the same time interval as FIG. 3a.
- the course of the engine speed n Mo gate fluctuates particularly at the beginning of the time interval shown, which indicates a very uneven ride.
- the engine speed n Mo tor drops sharply, whereupon it rises again.
- the burglary and the subsequent increase in the time derivative of the engine load torque dT Las t / dt which is shown in Figure 3a, together.
- the engine speed n Mo gate drops significantly.
- FIG. 3c shows a profile of an acceleration B over time in t over the same time period, which is also shown in FIGS. 3a and 3b.
- the acceleration varies considerably and is partially negative. This suggests that the ride is off-road.
- the biggest drop in the course of the acceleration B occurs to the event E2, in which the acceleration is strongly negative.
- a correlation of the event E1 with special conditions in the course of the acceleration B can not be determined. Also, no correlation of the course of temporal
- Last torque dT Las t / dt and the acceleration signal B are used to influence the threshold SW.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Control Of Transmission Device (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014224666.0A DE102014224666B4 (en) | 2014-12-02 | 2014-12-02 | Detection of a switching process |
PCT/EP2015/072325 WO2016087075A1 (en) | 2014-12-02 | 2015-09-29 | Detection of a shift operation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3227173A1 true EP3227173A1 (en) | 2017-10-11 |
EP3227173B1 EP3227173B1 (en) | 2019-12-25 |
Family
ID=54252277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15775150.4A Active EP3227173B1 (en) | 2014-12-02 | 2015-09-29 | Detection of a shift operation |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3227173B1 (en) |
CN (1) | CN107000807B (en) |
DE (1) | DE102014224666B4 (en) |
TW (1) | TW201632382A (en) |
WO (1) | WO2016087075A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11530015B2 (en) | 2019-02-15 | 2022-12-20 | Sram, Llc | Bicycle control system |
US11738826B2 (en) | 2019-02-15 | 2023-08-29 | Sram, Llc | Bicycle control system |
US11518472B2 (en) * | 2019-02-15 | 2022-12-06 | Sram, Llc | Bicycle control system |
CN109987040B (en) * | 2019-03-26 | 2020-02-18 | 武汉理工大学 | Automobile gear shifting signal identification method and device |
CN110132405B (en) * | 2019-05-29 | 2021-12-21 | 中国第一汽车股份有限公司 | Gear off and on noise identification system and method |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010158090A (en) * | 2008-12-26 | 2010-07-15 | Gs Yuasa Corporation | Electric vehicle |
DE102010028656A1 (en) * | 2010-05-06 | 2011-11-10 | Robert Bosch Gmbh | Method for estimating a torque and device for estimating a torque for pedal drives |
DE102010028658A1 (en) * | 2010-05-06 | 2011-11-10 | Robert Bosch Gmbh | Method and apparatus for automatically controlling the gear of an electric bicycle transmission |
EP2582571B1 (en) | 2010-06-17 | 2016-10-19 | TQ-Systems GmbH | Control unit for a vehicle and method for changing gears of a vehicle |
CN102756668B (en) * | 2011-04-29 | 2015-09-30 | 久鼎金属实业股份有限公司 | The speed-change control device of Electrical Bicycle |
CN103057654B (en) * | 2011-10-20 | 2015-08-19 | 久鼎金属实业股份有限公司 | There is the morpet of smooth and easy speed changing function |
DE102012018205B3 (en) * | 2012-09-14 | 2013-11-28 | Audi Ag | Method for performing a switching operation of manual transmission for bicycle having pedal drive, involves increasing driving torque of hub on rear wheel drive, during performance of switching process |
WO2014059953A1 (en) * | 2012-10-16 | 2014-04-24 | Mráz Richard | Method and device for shifting gears on an electric bicycle |
TWI525017B (en) * | 2012-10-25 | 2016-03-11 | A shift system that reduces the speed of the motor when the bicycle is turned | |
DE102012219991A1 (en) * | 2012-10-31 | 2014-04-30 | Robert Bosch Gmbh | Bicycle with electric auxiliary drive and shift detection |
JP2014208522A (en) * | 2013-03-29 | 2014-11-06 | ヤマハ発動機株式会社 | Control device for electric bicycle, power unit for electric bicycle, and electric bicycle |
-
2014
- 2014-12-02 DE DE102014224666.0A patent/DE102014224666B4/en active Active
-
2015
- 2015-09-29 WO PCT/EP2015/072325 patent/WO2016087075A1/en active Application Filing
- 2015-09-29 EP EP15775150.4A patent/EP3227173B1/en active Active
- 2015-09-29 CN CN201580065395.6A patent/CN107000807B/en active Active
- 2015-11-30 TW TW104139910A patent/TW201632382A/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN107000807B (en) | 2020-07-14 |
TW201632382A (en) | 2016-09-16 |
DE102014224666B4 (en) | 2017-04-06 |
WO2016087075A1 (en) | 2016-06-09 |
DE102014224666A1 (en) | 2016-06-02 |
CN107000807A (en) | 2017-08-01 |
EP3227173B1 (en) | 2019-12-25 |
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